Drop me (firstname.lastname@example.org) a line if you use sublog or manage to hack something interesting into it.
Update: 17 Sep 2004. Terrence Yu (dead link) sent me a note about some hacks he added to sublog (dead link). I'm not using it here -- he changed the file format slightly -- but he has some good ideas. (The good ideas are being used here...)
Download Terrence's sublog-2 (local copy).